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In this paper we have studied the broadening of a temporal pulse propagating through a planar waveguide with an exponential variation of refractive index using the ray-optics approach as well as the wave-optics approach. The validity of the ray-optics approach has been studied and it has been shown that at large distances the corresponding predictions are not even qualitatively correct.
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Khular et al. (1976) studied this question.
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